摘要
文章针对非均匀土层中完全嵌入渐变摩擦桩屈曲问题,综合考虑了非均匀侧摩阻力和侧向基床反力,通过理论推导给出了3类典型边界条件下的四阶平衡微分方程,并编制基于bvp4c算法的Matlab程序求解屈曲特征值问题。屈曲载荷计算结果表明,边界条件、截面渐变率、基床反力系数比、土桩相对刚度以及侧摩阻力系数等因素对桩屈曲具有重要影响,土层非均匀性显著改变桩屈曲应力大小及危险截面位置。文中方法与结果可为桩基工程实践提供指导。
In this paper,a theoretical model for buckling problem of tapered friction piles fully embedded in inhomogeneous soils is established,considering both inhomogeneous friction resistance and lateral reaction.Fourth-order equilibrium differential equations under three typical boundary conditions are given,and a Matlab program based on bvp4c algorithm is developed to solve the eigenvalue problem.The results of buckling load show that the factors such as boundary constraint,tapered ratio,ratio of coefficient of subgrade reaction,pile-soil relative stiffness and lateral resistance have important influence on the buckling behaviors.The stiffness ratio of soil layer significantly changes the magnitude of buckling stress and the location of dangerous section.The results of this paper can provide guidance and suggestions for pile foundation engineering.
作者
邵先锋
陈曦鸣
杨泰朋
李凯
SHAO Xianfeng;CHEN Ximing;YANG Taipeng;LI Kai(Construction Company, State Grid Anhui Electric Power Co., Ltd., Hefei 230022, China;Anhui Electric Power Transmission and Transformation Co., Ltd., Hefei 230001, China;School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2020年第7期947-951,共5页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(51608005,11402001)
国网安徽省电力有限公司建设分公司科技资助项目(SGAHJYJSXLJS1800417)。
关键词
非均匀土层
渐变桩
屈曲行为
侧摩阻力
屈曲应力
inhomogeneous soil
tapered pile
buckling behavior
shaft friction
buckling stress
